There have been quite a few reports of red balloons. Keep in mind we're looking for DARPA red balloons. If your child is having a birthday party and likes red balloons, no need to send your pictures.
This one was nicely submitted by a geocacher who looked for a red balloon that turned out to be a nice attractant to a cellular phone store. The ones we are looking for have a number, and most have a DARPA flag.
Groundspeak is a 9 year old company that owns and operates Geocaching.com. Geocaching is a high-tech treasure hunting game played throughout the world by adventure seekers equipped with GPS devices. The basic idea is to locate hidden containers, called geocaches, outdoors and then share your experiences online.